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Finding the Fourth Proportional to 268,420.54, 402,380.52 and 90,803.95

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Solution

The fourth proportional to 268,420.54, 402,380.52 and 90,803.95 is: 136,121.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,420.54 : 402,380.52 = 90,803.95 : x
  2. Step 2: Convert to fraction form
    268,420.54/402,380.52 = 90,803.95/x
  3. Step 3: Cross multiply
    268,420.54x = 402,380.52 × 90,803.95
  4. Step 4: Simplify right side
    268,420.54x = 36,537,740,619.05
  5. Step 5: Solve for x
    x = 36,537,740,619.05/268,420.54
  6. Step 6: Final answer
    x = 136,121.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.